[v5,3/5] eventdev/rx_adapter: introduce per queue event buffer

  To configure per queue event buffer size, application sets
``rte_event_eth_rx_adapter_params::use_queue_event_buf`` flag
as true and is passed to ``rte_event_eth_rx_adapter_create_with_params``
api.

The per queue event buffer size is populated  in
``rte_event_eth_rx_adapter_queue_conf::event_buf_size`` and passed
to ``rte_event_eth_rx_adapter_queue_add`` api.

Signed-off-by: Naga Harish K S V <s.v.naga.harish.k@intel.com>
---
 .../prog_guide/event_ethernet_rx_adapter.rst  | 19 ++++++++++++-------
 lib/eventdev/rte_event_eth_rx_adapter.h       |  4 ++++
 2 files changed, 16 insertions(+), 7 deletions(-)
  

> -----Original Message-----
> From: Naga Harish K, S V <s.v.naga.harish.k@intel.com>
> Sent: Monday, October 4, 2021 11:11 AM
> To: jerinj@marvell.com; Jayatheerthan, Jay <jay.jayatheerthan@intel.com>
> Cc: dev@dpdk.org
> Subject: [PATCH v5 3/5] eventdev/rx_adapter: introduce per queue event buffer
> 
> To configure per queue event buffer size, application sets
> ``rte_event_eth_rx_adapter_params::use_queue_event_buf`` flag
> as true and is passed to ``rte_event_eth_rx_adapter_create_with_params``
> api.
> 
> The per queue event buffer size is populated  in
> ``rte_event_eth_rx_adapter_queue_conf::event_buf_size`` and passed
> to ``rte_event_eth_rx_adapter_queue_add`` api.
> 
> Signed-off-by: Naga Harish K S V <s.v.naga.harish.k@intel.com>
> ---
>  .../prog_guide/event_ethernet_rx_adapter.rst  | 19 ++++++++++++-------
>  lib/eventdev/rte_event_eth_rx_adapter.h       |  4 ++++
>  2 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
> index 8526aecf57..8b58130fc5 100644
> --- a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
> +++ b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
> @@ -62,12 +62,14 @@ service function and needs to create an event port for it. The callback is
>  expected to fill the ``struct rte_event_eth_rx_adapter_conf structure``
>  passed to it.
> 
> -If the application desires to control the event buffer size, it can use the
> -``rte_event_eth_rx_adapter_create_with_params()`` api. The event buffer size is
> -specified using ``struct rte_event_eth_rx_adapter_params::event_buf_size``.
> -The function is passed the event device to be associated with the adapter
> -and port configuration for the adapter to setup an event port if the
> -adapter needs to use a service function.
> +If the application desires to control the event buffer size at adapter level,
> +it can use the ``rte_event_eth_rx_adapter_create_with_params()`` api. The event
> +buffer size is specified using ``struct rte_event_eth_rx_adapter_params::
> +event_buf_size``. To configure the event buffer size at queue level, the boolean
> +flag ``struct rte_event_eth_rx_adapter_params::use_queue_event_buf`` need to be
> +set to true. The function is passed the event device to be associated with
> +the adapter and port configuration for the adapter to setup an event port
> +if the adapter needs to use a service function.
> 
>  Adding Rx Queues to the Adapter Instance
>  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> @@ -79,7 +81,9 @@ parameter. Event information for packets from this Rx queue is encoded in the
>  ``ev`` field of ``struct rte_event_eth_rx_adapter_queue_conf``. The
>  servicing_weight member of the struct  rte_event_eth_rx_adapter_queue_conf
>  is the relative polling frequency of the Rx queue and is applicable when the
> -adapter uses a service core function.
> +adapter uses a service core function. The applications can configure queue
> +event buffer size in ``struct rte_event_eth_rx_adapter_queue_conf::event_buf_size``
> +parameter.
> 
>  .. code-block:: c
> 
> @@ -90,6 +94,7 @@ adapter uses a service core function.
>          queue_config.rx_queue_flags = 0;
>          queue_config.ev = ev;
>          queue_config.servicing_weight = 1;
> +        queue_config.event_buf_size = 1024;
> 
>          err = rte_event_eth_rx_adapter_queue_add(id,
>                                                  eth_dev_id,
> diff --git a/lib/eventdev/rte_event_eth_rx_adapter.h b/lib/eventdev/rte_event_eth_rx_adapter.h
> index 846ca569e9..70ca427d66 100644
> --- a/lib/eventdev/rte_event_eth_rx_adapter.h
> +++ b/lib/eventdev/rte_event_eth_rx_adapter.h
> @@ -200,6 +200,8 @@ struct rte_event_eth_rx_adapter_queue_conf {
>  	 * Valid when RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR flag is set in
>  	 * @see rte_event_eth_rx_adapter_queue_conf::rx_queue_flags.
>  	 */
> +	uint16_t event_buf_size;
> +	/**< event buffer size for this queue */
>  };
> 
>  /**
> @@ -267,6 +269,8 @@ struct rte_event_eth_rx_adapter_params {
>  	 * This value is rounded up for better buffer utilization
>  	 * and performance.
>  	 */
> +	bool use_queue_event_buf;
> +	/**< flag to indicate that event buffer is separate for each queue */
>  };
> 
>  /**
> --
> 2.25.1

Acked-by: Jay Jayatheerthan <jay.jayatheerthan@intel.com>